Replacing `import` with `accio` in cpython

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Replacing `import` with `accio`: Compiling Pythons with Custom Grammar for the sake of a joke! These are the slides from my 03/25/14 talk at NYC Hack and Tell.

Tecnologia Educação

>>> import sys!
>>> accio sys!
SyntaxError

>>> accio sys!
>>> import sys!
SyntaxError

we’ll learn:!
how does
Python know
the difference?

statements
are deﬁned in
the Grammar!
ﬁle

import_stmt: !
import_name | !
import_from

import_name: !
‘import’ !
dotted_as_names

import_name: !
‘accio’ !
dotted_as_names

import sys!
^!
SyntaxError:
invalid syntax

accio sys!
^!
SyntaxError:
invalid syntax

import_name: !
‘import’ !
dotted_as_names!
| ‘accio’ !
dotted_as_names

links
• Grammar - https://docs.python.org/2/reference/
grammar.html
• EBNF - http://en.wikipedia.org/wiki/
Extended_Backus%E2%80%93Naur_Form
• Adding a statement - http://
eli.thegreenplace.net/2010/06/30/python-
internals-adding-a-new-statement-to-python/

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